Synchronous motor job time



NOV. 6, 1934. L, -row 1,979,319

SY NCHRONOUS MOTOR JOB TIME RECORDER Filed Sept. 24, 1932 Patented Nov.6, 1934 UNETED STATES PATENT OFFICE SYN CHRONOUS MOTOR JOB TIME RECORDERApplication September 24, 1932, Serial No. 634,667

5 Claims.

My invention relates to job time recorders and more specifically to asynchronous motordriven job time recorder arranged to suspend operationduring non-working periods.

, The purpose of a job time recorder is to make a printed record of thetime a Workman starts and stops work on a given job. This printed recordis used by the cost-keeping department as a basis for determining thelabor cost involved in manufacturing a given product.

The workman is provided with a card or ticket upon which he stamps thestarting time by inserting the card in the job time recorder andmanually actuating the imprint lever which causes the recorder to make atime imprint. When he finishes that particular job he again inserts thatsame ticket in the job time recorder and makes a second time imprint.The difference in time between these two imprints indicates the elapsedtime involved on that particular job.

As described in my co-pending application, Serial No. 634,666, filedSeptember 24, 1932, in certain cost-keeping systems it is desirable tohave job time recorders automatically stop operating during thenon-working periods, which are usually the lunch and supper periods.This is a practice that has been quite extensively used with minuteimpulse systems but has not been made use of with synchronousmotor-driven recorders, because the recorders would not operate insynchronism when started and stopped, due to the fact that certainmotors will start slower than others and also that certain motors willrun longer after the current has been cut off.

When the recorders are arranged to eliminate the non-working periods,the type wheels cover a period of less than twenty-four hours. Forinstance, many job recorders cover a cycle of twenty-two hours.Therefore, in each day of twenty-four hours the recorder must be idlefor two hours. This two-hour period may be divided into three divisions,using one-half hour for lunch, one-half hour for supper and one hour tobe eliminated usually just before the beginning of the next working day.Occasionally, recorders are arranged for a twenty, twentyone, or atwenty-three hour period.

The system disclosed in my co-pending application, Serial No. 634,666,involved the use of two circuits between the master and secondaryapparatus. One of the objects of my invention is to provide a systemwith means for correcting the daily error occasioned by the difierentrates at which the motor picks up after it has stopped and drifts afterit has been cut ofi which involves the use of only one circuit betweenthe master and secondary apparatus.

Further objects will be apparent from the description and claims.

In the drawing, in which an embodiment of my invention is shown:

Figure l is a diagrammatic view of my improved system.

Referring to the drawing in detail, the system shown therein comprises aplurality of secondary apparatuses 1, each secondary apparatuscomprising a synchronous motor 2, a cam wheel 3, driven by thissynchronous motor 2, a switch 4 controlled by this cam wheel 3 forcutting ofi the secondary apparatus at the end of its cycle, and masterapparatus including a synchronous motor 5, a pair of cam Wheels 6 and 7driven by this master synchronous motor, a sequence switch 8 controlledby the cam wheel 6 for controlling the stopping and starting of themotor for the non-working periods, a normal voltage circuit 9 for thenormal supply to the master and secondary apparatuses, a high voltagecircuit 10 for starting the secondary apparatuses after they havestopped at the end of their cycle and a pair of sequence switches 11controlled by the cam wheel 7 for periodically cutting in the highvoltage current on the circuits for the secondary apparatuses.

In addition to the above apparatus, each secondary apparatus is providedwith a resistance coil 12, in bridge of the cam-controlled switch 4, sodesigned that when the switch 4 is open the normal voltage will beinsufficient to operate the secondary synchronous motor 2 but so thatwhen the high voltage is cut in, it will be sufiicient to causeoperation of the secondary synchronous motor.

In use, the cam wheel 6 will be designed so as to stop the secondaryapparatus at the beginning of each non-working period and start it againat the end of each non-working period. Thus, if there is a non-workingperiod from 12:00 noon to 12:30 P. M., the cam wheel 6 will momentarilyenergize the electro-magnet 13 which will advance the sequence switch 8a quarter revolution, bringing the low point of the rotor underneath thecontact 14 and thus interrupting the power circuit to the secondaryapparatus.

At the end of each non-working period, the cam wheel 6 again momentarilycloses the cirquence switch 8 to be given another quarter turn, bringingthe high spot of the rotor underneath the contact 14 and thus completingthe power circuit for the secondary apparatus causing the secondaryapparatus to start up again at the end of the non-working period. Thisoperation is repeated for each non-working period and throughout theday.

As previously indicated, in a system in common use, it is usual to havea non-working period for lunch, a non-working period for supper, and aperiod of idleness at the end of the daily cycle and just before thebeginning of the next days cycle. This period of idlenessbee tween theend of one cycle and the beginning of another varies but in some systemsan idle hour is provided so that each secondary apparatus stops itselfan hour before the beginning of the next days cycle, thus insuring thatall of,

the secondary apparatuses are brought into substantial synchronism onceeach day, preventing any cumulative error due to starting and stopping.'For instance, if the days cycle begins at 7:' OOofclOck, each secondaryapparatus will cut itself off from the power circuit at 6: 00 oclock.This automatic cut-off is accomplished by the cam wheel 3, which may beso designed that at the contacts 4, thus re-establishing the normal theend of the days cycle, for example at 6: 00 A. M., by secondaryapparatus time, the cam wheel 3 will permit the movable contact 4 todrop, interrupting the normal power circuit and stopping the motor 2.

To start thesecondary apparatus up again, the master control cam wheel'7 is designed to momentarily close the circuit at the beginning of thenew cycle, energizing the electromagnet 15 and causing the rotors of thesequence switches 11 to'be turned an eighth of a revolution.'Thisperniits the movable contacts 16 todisen'gage the normal voltagecontacts 17 and. to engagethe'high voltage contacts 18, thus switchingthe secondary circuit from normal voltage to high voltage. This highvoltage is sufficient to start up the secondary apparatuses in spite ofthe resistance 12 so that at the begin ning of the cycle all of thesecondary apparamen/11 be started up at'thesame time in synchronismiwith the master clock. The cam wheels 3 of the secondaryapparatusesareso designed that shortly after they are started up atthebeginning of the new cycle they, will lift circuits so that thesecondaries can now be operated onnormal voltage. Shortly afterthistakes iplace, thefcam wheel '7 of the master clock will againmomentarily energize the electromagn'et 15, again advancing each of therotors of the sequence switches 11 an eighth of a revolution, liftingthe contacts 16 and re-establishing the normal voltage connections forthe secondary circuit.

,It is obvious that there will be some saving of electrical energy ifthe contact 14 is caused to open at theend of the cycle. This can beaccomplished by a suitable design of the cam wheel 6 which can be madeto open the circuit 19 just after the end of the cycle of the second aryclocks and to close it again just before the beginning of the new cycle.

Further modifications will be apparent to those skilled, inthej artandit is desired, therefore, that the invention be limited only by theprior art and the scope of the appended claims.

Having thus described my invention, what I claim and desire tosecure byLetters Patent is:

1., A synchronous motor 3 0b timerecorder System comprising masterapparatus and a plurality of secondary apparatuses, each secondaryapparatus comprising a synchronous motor and means controlled by theindividual secondary apparatus time for stopping it at the end of itscycle, said master apparatus comprising means controlled by masterapparatus time for stopping the secondary apparatus, and for startingthe secondary apparatuses after they have been stopped by the masterapparatus, and means controlled by master apparatus time for startingthe secondary apparatuses after they have been stopped by the secondaryapparatuses themselves at the end of their cycles, said system havingbut a single circuit between the master and secondary apparatus.

2. A synchronous motor job time recorded system comprising masterapparatus and a plurality of secondary apparatuses, each secondaryapparatus comprising a synchronous motor and means controlled by theindividual secondary apparatus time for stopping it at the end of itscycle, said master apparatus cofmprisingmeans controlled by, masterapparatus time for stopping the secondaryapparatus, and for startingvthe secondary apparatuses after they have been stopped by the masterapparatus, and means controlled by masteriapparatus, time iorstartingthe secondary apparatusesjaiiter they have been stopped by the secondaryapparatuses themselves at the end of their cycles, said, systemhaving abut a single circuit between the. master and secondary apparatus, saidsecondary apparatus stopping means comprising means for increasing theresistance of the secondary motor circuit to prevent normal voltage.from operating 1! the motor, and said means for starting the secondaryapparatus after.v it has been stopped at the end of its cycle includingmeans controlled by the master apparatus for increasing the voltage forthe secondary apparatus motor sufie ciently to start it notwithstandingtheincreased resistance. p

3- A synchronous motor job. time recorder system comprisingmasterapparatus and a pluralityof secondary apparatuses,each-secondary iiiapparatus comprising a synchronous motor and means controlled bythe-individual secondary apparatus time for stopping, it. at, the end ofits cycle, said 'masterapparatus comprisingmeans 19.5 controlled bymaster apparatus,v time for ,stopping the secondary apparatus, andforstarting thei -secondary apparatuses after they have, been stoppe'dlbythe master. apparatus, andmeans controlled by master apparatus time forstarting 13 the secondary apparatuses after they have been s. stopped bythe secondary apparatuses themselves at the end of their cycles,saidsystem having but a single circuit between themaster and secondaryapparatus, 1 said secondary ap paratus stopping means comprising meansfor increasingthe resistance of. the secondary mo? tor circuit toprevent normal voltage from opcrating the motor, andsaid means forstarting The secondary apparatus aftenit has been stopped at the end ofitscycle including means controlled by the master, apparatus forincreasing the voltage for the secondary apparatus motor sufficiently tostart itnotwithstanding the increased resistance, said voltageincreasing means comprisingswitch means controlled .by master apparatustime for switching fromnormal voltage, to high voltage. f

4. A synchronous motor job,.time,-recorder; yst m c mpr si i ta r a e ns- 9 rality of secondary apparatuses, each secondary apparatuscomprising a synchronous motor and means controlled by the individualsecondary apparatus time for stopping it at the end of its cycle, saidmaster apparatus comprising means controlled by master apparatus timefor stopping the secondary apparatus, and for starting the secondaryapparatuses after they have been stopped by the master apparatus, andmeans controlled by master apparatus time for starting the secondaryapparatuses after they have been stopped by the secondary apparatusesthemselves at the end of their cycles, said system having but a singlecircuit between the master and secondary apparatus, said secondaryapparatus stopping means comprising means for increasing the resistanceof the secondary motor circuit to prevent normal voltage from operatingthe motor, and said means for starting the sec-, ondary apparatus afterit has been stopped at the end of its cycle including means controlledby the master apparatus for increasing the voltage for the secondaryapparatus motor sufficiently to start it notwithstanding the increasedresistance, said resistance-increasing means comprising a switchcontrolling the circuits for the secondary motor controlled by themovement of said motor, and a resistance in bridge of said switch.

5. In a job time recorder system, master apparatus, a plurality ofsynchronous motor time controlled recorders, means in said masterapparatus for stopping said recorders at the beginning of each of aplurality of non-working periods and for starting said recorders at thetermination of each of said non-working periods, and means forperiodically synchronizing said recorders to correct for differences instarting and stopping rates of the synchronous motors, said systemcontrolled entirely over a single circuit connecting said masterapparatus and said recorders.

ADOLPI-I L. DENNISTON.

